<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 头部警告区域 -->
      <el-alert title="注意：只允许为第二级分类设置相关属性！" type="warning"  show-icon  :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_pot">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <!-- options 用来指定数据源 -->
          <!-- props 用来指定配置对象 -->
          <el-cascader :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="CateChanged" clearable>
          </el-cascader>
        </el-col>
      </el-row>

      <!-- 商品属性标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many" >
          <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- 循环渲染Tag标签 -->
                <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">{{ item }}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row._id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row._id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
           <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible = true">添加属性</el-button>
           <!-- 静态参数表格 -->
           <el-table :data="onlyTableData" border stripe>
             <!-- 展开行 -->
             <el-table-column type="expand">
               <template slot-scope="scope">
                 <!-- 循环渲染Tag标签 -->
                 <el-tag v-for="(item, index) in scope.row.attr_vals" :key="index" closable @close="handleClose(index, scope.row)">{{ item }}</el-tag>
                 <!-- 输入文本框 -->
                 <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small"
                 @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                 </el-input>
                 <!-- 添加按钮 -->
                 <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
               </template>
             </el-table-column>
             <!-- 索引列 -->
             <el-table-column type="index" label="#"></el-table-column>
             <el-table-column label="属性名称" prop="attr_name"></el-table-column>
             <el-table-column label="操作">
               <template slot-scope="scope">
                 <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row._id)">编辑</el-button>
                 <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row._id)">删除</el-button>
               </template>
             </el-table-column>
           </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加动态参数或添加静态属性对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClose">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText + '：'" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClose">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText + '：'" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>！

<script>
export default {
  data () {
    return {
      // 商品分类数据
      catelist: [],
      // 指定级联选择器的配置对象
      cateProps: {
        value: '_id',
        label: 'title',
        children: 'children',
        expandTrigger: true,
        checkStrictly: true
      },
      // 选中的商品分类的Id数组
      selectedCateKeys: [],
      // 默认选中标签页
      activeName: 'many',
			// 默认为动态参数
			type: 1,
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
				attr_name: ''
			},
      // 添加参数的表单验证对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 控制修改对话框的显示与隐藏
      editDialogVisible: false,
      // 修改参数的表单数据对象
      editForm: {},
      // 修改参数的表单验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
    }
  },
  created () {
    // 获取所有的商品分类列表
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.code !== 200) return this.$message.error(res.msg)
			this.$message.success(res.msg)
      this.catelist = res.data;
			this.catelist.forEach(item => {
				item.children.forEach((items,index)=>{
					delete items.children;
				})
			})
      console.log(this.catelist)
    },
    // 选择项发生变化触发这个函数
    CateChanged () {
      this.getParamsData()
    },
    // Tab 点击事件的处理函数
    handleTabClick () {
      console.log(this.activeName)
			this.activeName == 'many' ? (this.type = 1) : (this.type =2)
      this.getParamsData()
    },
    // 动态参数或者静态属性数据网络请求
    async getParamsData () {
			console.log(this.selectedCateKeys);
      // 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 2) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 证明选中的是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的Id，和当前所处的面板，获取对应的参数
      const { data: res } = await this.$http.get(`categories/params/${this.type}/${this.selectedCateKeys[this.selectedCateKeys.length-1]}`)
			console.log('res',res);
      if (res.code !== 200) return this.$message.error(res.msg)
			this.$message.success(res.msg)
      res.data.forEach(item => {
        // 控制文本款的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      // console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/add_attr/${this.type}`, {
					cate_id: this.cateId,
          attr_name: this.addForm.attr_name
        })
				console.log(res);
        if (res.code !== 200) return this.$message.error(res.msg)
        this.$message.success(res.msg)
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击按钮,展示修改的对话框
    async showEditDialog (cateId) {
      const { data: res } = await this.$http.get(`categories/params/${this.type}/${this.selectedCateKeys[this.selectedCateKeys.length-1]}`,{ 
				params: {
					cate_id: cateId
				}
			})
			console.log(res);
      if (res.code !== 200) return this.$message.error(res.msg)
			this.$message.success(res.msg)
      this.editForm = res.data;
      this.editDialogVisible = true
    },
    // 重置修改的表单
    editDialogClose () {
      this.$refs.editFormRef.resetFields()
      this.editForm = {}
    },
    // 点击按钮,修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) { return }
        const { data: res } = await this.$http.put(`categories/modify_attr/${this.type}/${this.editForm._id}`, {
          attr_name: this.editForm.attr_name
        })
        if (res.code !== 200) return this.$message.error(res.msg)
        this.$message.success(res.msg)
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据Id删除对应的参数项
    async removeParams (cateId) {
      const confirmResult = await this.$confirm('此操作将永久删除该分类参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 用户取消了删除操作
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除！')
      }
      // 删除的逻辑
      const { data: res } = await this.$http.delete(`categories/del_attr/${this.type}/${cateId}`)
			console.log(res);
      if (res.code !== 200) return this.$message.error(res.nsg)
      this.$message.success(res.msg)
      this.getParamsData()
    },
    // 文本款失去焦点,或按下了ENTER都会触发
    async handleInputConfirm (row) {
      // console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有return,则证明输入的内容,需要做后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存这次操作
      this.saveAttrVals(row)
    },
    // 将对 attr_vals的操作保存到数据库
    async saveAttrVals (row) {
			console.log('save',row);
      // 需要发起请求保存这次操作
      const { data: res } = await this.$http.post('categories/add_val', {
        type: this.type,
				_id: row._id,
				attr_val: row.attr_vals 
      })
			console.log(res)
      if (res.code !== 200) return this.$message.error(res.msg)
      this.$message.success(res.msg)
    },
    // 点击按钮,展示文本输入框
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick 方法的作用,就是当页面上元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数可选项
    handleClose (index, row) {
      row.attr_vals.splice(index, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisable () {
      if (this.selectedCateKeys.length !== 2) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的Id
    cateId () {
      if (this.selectedCateKeys.length === 2) {
        return this.selectedCateKeys[1]
      }
      return null
    },
    // 动态计算标题的文本
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>

<style lang="less" scoped>
  .cat_pot {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>
